There are hard calluses on the palms of the feet, which may be the cause of callus, corns, plantar warts and so on. 1. Callus: mainly due to the local long-term pressure and friction caused by the excessive proliferation of the stratum corneum. It occurs in the palm and metatarsal parts that are subject to pressure and friction, and will cause the skin to appear yellow, or wax yellow thickened keratinous plaques, which will appear flat or slightly elevated in appearance, with the center being thicker and the edges being thinner, and the texture being firm and the border being unclear. 2. Chicken eye: is due to the local excessive friction caused by the excessive proliferation of the stratum corneum, often involved in the prominent parts of the force, such as the outer side of the little toe or the middle lesser toes of the medial edge, can also lead to calluses on the palms of the feet. 3. metatarsal warts: is caused by human papilloma virus infection, due to pressure will form a yellowish or tawny callus-like plaques or flat papules, the surface is rough, part of the visible capillary rupture bleeding and the formation of small black spots. Calluses on the palms of the feet, need to go to the hospital in time to check and clarify the cause of the disease.